Bearings – Rotary bearing – Fluid bearing
Reexamination Certificate
2005-08-30
2005-08-30
Footland, Lenard A. (Department: 3682)
Bearings
Rotary bearing
Fluid bearing
C384S120000
Reexamination Certificate
active
06935786
ABSTRACT:
A hydraulic bearing that supports a rotating shaft comprises a bearing metal. On a surface of the bearing metal, a hydrostatic pocket and a land portion are formed. The land portion is defined by the hydrostatic pocket and generates hydrodynamic pressure in response to a rotation of the rotating shaft. The hydraulic bearing further comprises a pressure fluid supplying source and an oil-supplying hole. The oil-supplying hole is opened in the hydrostatic pocket and provides pressure fluid from the pressure fluid supplying source to the hydrostatic pocket. On the land portion, a drain hole that drains the fluid is formed. On the way of a drain passage, a check valve is disposed. Since the drain hole does not separate the land portion, deterioration of bearing rigidity is restrained. Further, since the fluid is drained through the drain hole, thermal expansion of the bearing metal due to heat generation of the fluid is restrained. Moreover, according to the check valve, it is possible to prevent suctioning air into the hydraulic bearing when negative pressure generates at the land portion.
REFERENCES:
patent: 4181378 (1980-01-01), Schmaeng
patent: 4285551 (1981-08-01), Suzuki et al.
patent: 5447375 (1995-09-01), Ochiai et al.
patent: 5700092 (1997-12-01), Wasson et al.
patent: 6547438 (2003-04-01), Shima
patent: 10-227312 (1998-08-01), None
patent: 10-259823 (1998-09-01), None
Hirano Minoru
Shima Toshihiko
Footland Lenard A.
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Toyoda Koki Kabushiki Kaisha
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